https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13992847Edit ImageSaveSaveEditCropCustom TextJohn Tyndall demonstrating a fog-horn to Queen Victoria and her entourage. Wood engraving by T. B. Wirgman, c.1876.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 867 px | 300 dpiLarge JPEG 3100 x 2240 px | 300 dpiFree DownloadJohn Tyndall demonstrating a fog-horn to Queen Victoria and her entourage. Wood engraving by T. B. Wirgman, c.1876.More